Balanced valve



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D. MERCER. BALANGED VALVL No. 312,000. Patented Peb. l0, i885.

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DAVID MERCER, OF BETHLEHEM, PENNSYLVANIA.

BALANCED VALVE.

SPECIFICATION forming part of Letters Patent No. 312,000, dated February10, 1.885.

Application filed July 5, 1884. (No model.)

To CLZZ wiz/0m, it may concern:

Be it known that I, DAVID MERCER, of Bethlehem, in the county ofNorthampton and State of Pennsylvania, have invented certain new anduseful Improvements in Balanced Valves, of which improvements thefollowing is aspecification.

My invention relates to valves for regulating and directing the passageof fluids under high pressures; and its object is to prevent lthe rapidwear of the surfaces in contact, and the waste by leakage of the fluidthereat, which has heretofore been occasioned by the excessive pressureacting on such valves.

To this end my improvements consist in certain novel devices andcombinations of mechanism for relieving the valve of undue pressure andmaintaining it in such normal relation to its seat that its movement maybe effected without injurious friction, and the leakage of fluid shallbe effectually prevented.

The improvements claimed are hereinafter fully set forth.

In the accompanying-drawings, Figure 1 is a vertical longitudinalcentral section through a valve and casing embodying my invention; Fig.2, a vertical longitudinal section through the same at the line x x ofFig. 3; Fig. 3, a vertical transverse central section; Fig. 4, ahorizontal section through the casing at the line y y of Fig. 1, withthe pressure-cage removed; and Fig. 5, a view in perspective of one ofthe bearing-blocks and its inclined ways or bearings.

In the practice of my invention I provide a valve chest or casing, 1, ofproper strength to resist the pressure of the fluid whose passage is tobeV governed by the valve, which is closed at its top by a removable lidor bonnet, 2, secured by bolts 3 to the casing, and forming a tightjoint therewith. A valve or gate, 4, formed of two rectangular plates orbars connected by longitudinal bars, is fitted l truly to and adapted toslide longitudinally on a valve-face, 5, in the casing, the movement ofthe valve being effected bya stem, 6, passing through properly packedstuf fing -boxes 7 in the casing 1. Port-s S 9, formed in the valve-face5, communicate, respectively, with induction and eduction pipes 10 and11, secured to nozzles on one side of the valve-chest and leadingtherefrom to connections with the cylinder or other chamber or reservoirto and from which the fluid is to be supplied and exhausted, and ports12 and 13, located between the ports 8 and 9 and the ends of thevalve-chest, communicate with a chamber, 14, on the opposite side of thechest to the pipes 10 11. A discharge-pipe, 15, connected to a nozzle onthe side of the chamber 14, serves to carry off the fluid which has adesired point of discharge. Fluid is led into the chest through asupply-pipe, 16, connected through a stuffing-box, 17, to the outer endof a pressure cage or box, 18, which passes through a stuffing-box, 19,in the bonnet 2 of the valve-chest, and bears at bottom upon the top ofthe valve 4, and on two lateral ad-l j ustable blocks, 20, havinglongitudinally beveled or inclined lower faces, 21, which rest oncorresponding inclined ways or guides, 22, in

A chamber, 23, of enlarged transverse sectional area relatively to thatof the supplypipe 16, is formed in the lower portion of thepressure-cage 18, and a delivery-opening, 24, of smaller sectional areathan the supply-pipe, is formed` in the bottom of the chamber 23,establishing communication from the same to the space between the twoend plates or bars of the valve 4. The bearing of the pressurecage uponthe bearing-blocks may be increased or diminished, as required, bytheadjustment of the packing in the stuffing-box 19, and the properiitting of the pressure-cage against the valve 4 may be accuratelyregulated by the longitudinal adjustment of the bearing-blocks, which iseffected by means of adjustingscrews 25, having heads which t inT-shaped slots in the ends of the bearingblocks, said lscrews passingthrough the valvechest and being provided with nuts 26, adapted to bearagainst the outside thereof. By the provision of the chamber 23 anddeliveryopening 24 the valve 4 is relieved of the pressure of theincoming fluid, which acts upon the pressure-cage instead of upon thevalve, and by proper adjustment of the bearingblocks 20, which may bereadily made Without interfering with the operative relation of theparts, the bearing of the pressure-cage upon the valve may be regulatedto and maintained at such degree as is requisite to afford beenexhausted through the eductioirpipe to the valve-chest on each side ofthe valve 4.

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proper tight joints between the pressure-cage, the valve, and theValve-face, and undue and excessive friction and wear of the parts andleakage of fluid will be effectually prevented.

In the position shown in the drawings fluid supplied through the pipe 16will pass through the delivery-opening 24, and between the end plates ofthe valve 4 through the port 9 and pipe 11 to the cylinder or otherplace of utili- Zation, the discharge therefrom being made through thepipe' 11, ports 9 and 13, chamber 14, and discharge-pipe 15. By themovement of the valve to the left, so as to uncover the port 8 to theopening 24, the supply of fluid will be effected through the'pipe 10,and its by Letters Patent- 1. The combination of a valve-chest, a valvegoverning ports in a valve-face therein, a press ure cage or box ttingagainst the valve on the side thereofl opposite the valve-face, saidpressure-cage having a closed internal supply chamber, a supply-pipeleading into the sup ply-chamber and of smaller transverse sec tionalarea than said chamber, a delivery-passage of smaller transversesectional area than the supply-pipe and leading from the side of thechamber opposite said pipe into the valvechest, and bearings supportingthe pressurecage on opposite sides of the valve, substantially as setforth.

2. The combination ofavalve-chest, avalve, a pressure-cage, andadjustable bearing-blocks for supporting the pressure-cage andregulating the bearing thereof against the valve, substantially as setforth.

3. The combination of a valve-chest, a valve, a pressurecage, adjustablebearing -blocks supporting the pressu re-cage on its lower end, and astuffing-box adapted to regulate the bearing of the pressure-cage uponthe bearingbloeks, substantially as set forth.

4. The combination of a valvechest, a valve, a pressure-cage,bearingbloeks havi'ng longitudinally inclined or beveled lower faces,inelined guides or ways supporting said bearing-blocks, adjusting-screwscoupled. to said bearingblocks and passing through the walls of thevalveehest, and nuts engagingl said screws and adapted to bear againsttheoutside of the valve-chest, substantially as Vvset forth.

DAVID MERCER."A

Witnesses:

WVM. J. MoDnvrTT, JN0. TAYLOR.

